Works with most docks & fits most cases， covers， and skins (including Apple's Bumper， Lifeproof， and Otterbox);Passes all functionality through to your iPhone， iPod， or iPad;This dockStubz+ model includes charge conversion circuitry for older docks and accessories that use Firewire for charging;Compatible with all iPhone， iPod， and iPad models (except the Shuffle);Optionally inject power for charging via a micro USB jack on the side